I snapped the bolts for the rear u-joint straps when I was backing out of a parking space
I honestly wasn't doing anything extreme to make it do so, it just bound up and went SNAP! Fortunately there was a Kragen in the same parking lot so I bought a roll of duct tape and a Sunny D for the cap (friend said it fits over the stock slip yoke output perfectly) and taped it up and drove home. Following that I chipped a few teeth off the R&P in front of my friends shop. So in it went and got 4:88's
When I finally gave up on the Turdy 5 was when my R&P was toast yet again. I knew I wasn't going to get the guy who did the work to warranty it since he was flat out broke, so in went the 9"
I had third gear go out on me one time too. I'll admit I was driving the piss out of it at that point. Going from 2nd to 4th for a few weeks really, really SUCKED
Then I lost 5th gear about 4 months later in the tranny I had put in the old ones place. I still drove home at least. I seem to have also had good luck with breakage, good luck in the sense that even when sh!t breaks it still gets me home!